Yes, the net is complete, but Stella is showing the outer parts with the inner colour. Currently it tends to do this when multiple parts of different colours lie in a single plane, the nets show them all in one colour.

When this model is opened in the library it is displayed in the base stellation view. So you can fix that colour problem easily by putting the model into a memory, retrieving it again and activating the base view. Then you can select the inner parts and give them a different colour by using shift c.

Sorry for the very late 'thank you' people but I have been away from my computer for some time. I realised after posting that it was simply a question of the same colour being shown for both bits of the net. I simply printed out the same pages twice on different coloured paper! Anyway, thanks Robert and Ulrich for your replies.